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why its an issue: im suspecting that the kill task preforms cleanup on the hdfs resources(e.g jars). so when this kill issued and another index hadoop runs concurrently it will have issues accessing the jar in the classpath because of the resource cleanup

The "kill" task is to kill unused segments. I don't think this would cause you to run into a contention with any other hadoop task.

thanks for the clarification. i have this logs on the main thread after the task finished:

INFO [main] org.hibernate.validator.internal.util.Version - HV000001: Hibernate Validator 5.2.5.Final
2022-10-09T00:32:09,696 INFO [main] org.apache.druid.java.util.common.lifecycle.Lifecycle - Starting lifecycle [module] stage [ANNOUNCEMENTS]
2022-10-09T00:32:09,697 INFO [main] org.apache.druid.java.util.common.lifecycle.Lifecycle - Successfully started lifecycle [module]
2022-10-09T00:32:09,703 INFO [main] org.apache.druid.java.util.common.lifecycle.Lifecycle - Stopping lifecycle [module] stage [ANNOUNCEMENTS]
2022-10-09T00:32:09,705 INFO [main] org.apache.druid.java.util.common.lifecycle.Lifecycle - Stopping lifecycle [module] stage [SERVER]
2022-10-09T00:32:09,709 INFO [main] org.eclipse.jetty.server.AbstractConnector - Stopped ServerConnector@254513e8{HTTP/1.1,[http/1.1]}{0.0.0.0:8100}
2022-10-09T00:32:09,710 INFO [main] org.eclipse.jetty.server.session - node0 Stopped scavenging
2022-10-09T00:32:09,711 INFO [main] org.eclipse.jetty.server.handler.ContextHandler - Stopped o.e.j.s.ServletContextHandler@5fafa76d{/,null,UNAVAILABLE}
2022-10-09T00:32:09,715 INFO [main] org.apache.druid.java.util.common.lifecycle.Lifecycle - Stopping lifecycle [module] stage [NORMAL]

are they related to the task shutdown or to the MM shutdown?